Table 3

Dynamic models1of gains in BMI, FFM or FM by category of physical activity change. Persistently medium/low MVPA is the reference
Decreasing Increasing Persistently high
β 95%CI β 95%CI β 95%CI
ΔBMI model N = 205 (Boys = 87, Girls = 118)
Girls −0.19 −0.77, 0.39 −0.22 −2.02, 1.59 −0.25 −0.91, 0.40
Boys 0.16 −0.89, 1.21 0.76 0.06, 1.44* 0.41 −0.15, 0.97
ΔFFM model N = 196 (Boys = 84, Girls = 112)
Girls 0.16 −0.45, 0.77 0.08 −1.36, 1.52 0.43 −0.11, 0.97
Boys 0.67 −0.39, 1.72 1.10 0.37, 1.84* 0.20 −1.43, 1.84
ΔFM model N = 196 (Boys = 84, Girls = 112)
Girls 2 −1.36 −1.93, -0.79** −1.23 −2.14, -0.33* −1.06 −1.62, -0.50**
Boys −0.30 −1.77, -1.18 0.39 −0.75, 1.53 0.52 −0.59, 1.62

Abbreviations: MVPA = moderate-vigorous physical activity, ΔFM = fat mass gain, ΔFFM = fat free mass gain, ΔBMI = BMI gain β = regression coefficient, CI = confidence interval.

1 Adjusted by initial BMI, FM or FFM, respectively, and initial energy intake and height, age, gender, socioeconomic status and changes in energy intake and height. Grouping variable = School affiliation during the first survey. R2 for models: BMI = 0.18; FFM = 0.20; FM = 0.55.

2 P value of increasing x gender interaction: 0.044; P value of persistently high x gender interaction: 0.048.

Level of statistical significance: * P value < 0.05; ** P value < 0.01.

Jáuregui et al.

Jáuregui et al. BMC Pediatrics 2012 12:109   doi:10.1186/1471-2431-12-109

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